Alloy K / Kovar / Nilo K (ASTM F15)


Technical Data Sheet

Kovar Chemical Composition (Basic Density 8.36)
Weight % Ni Fe Co C Mn Si Al Cr Mg Zr Ti Cu Mo
Alloy K
Kovar		 29.0 53.0 17.0 0.04 max 0.50 max 0.20 0.10 max 0.20 max 0.10 max 0.10 max 0.10 max 0.20 max 0.20 max

Kovar (Alloy K) is a nickel-iron-cobalt controlled-expansion alloy containing 29% nickel. Its coefficient of expansion, which decreases with rising temperature to the inflection point, matches the expansion rate of borosilicate glasses and alumina ceramics. Kovar (Alloy K) is used for glass-to-metal seals in applications requiring high reliability or resistance to thermal shock. Kovar (Alloy K) is used for high-power transmitting valves, transistor leads and headers, integrated-circuit lead frames, and photography flash bulbs.

Typical Mechanical Properties

Material Condition Yield Strength (0.1% Offset) Tensile Strength Elongation %
psi MPa psi MPa
Alloy K
Kovar		 Annealed 49,000 340 75,000 520 42

Availability
Alloy K / Kovar is available (further details below) in Bar, Rod, Tube, Sheet, Strip, Coil, Plate and Wire. For all stock availability contact Sales for further availability.
Alloy K Tube is available the following size ranges.

Outside Diameter

-

0.25mm (0.010") up to 16.00mm (0.625")

Wall

-

0.05mm (0.002") up to 1.00mm (0.040")

Straight Lengths

-

1.00mm (0.040") up to 5000.00mm (197")

Coils Lengths

-

5 Metres to 15 Metres

Standard Tolerance

-

OD &ID +/-0.03mm (0.0012")

 

-

Wall +/- 10%

Tight Tolerance

-

OD&ID +/- 0.015mm (0.0006")

 

-

Wall +/-3%

Some thin wall tubes up to 25.40 mm (1.000") can be supplied.

Specifications
UNS K94610
Werkstoff Nr 1.3981
DIN 17745
ASTM F 15
AMS 7726 Wire
AMS 7727 Bars and Forgings
AMS 7728 Sheet, Strip and Plate
MIL-I-23011 class 1
AFNOR NF A54-301
S.E.W 385
DILVER P

Registered Names
Kovar ®
Nicoseal ®
Nicosel ®
Rodar ®
Telcoseal ®
Sealvar ®
Alloy 29-17 ®
Nilo K ®
Dilver ®
Pernifer 29-18 ®

We are experts in difficult to obtain sizes contact Sales for many other sizes and forms. Below is an example of availabilty

ASTM 15 Alloy / Kovar Strip - Kovar Coil Thickness
0.004 0.0142 0.045
0.0045 0.0145 0.050
0.005 0.015 0.059
0.006 0.020 0.060
0.007 0.025 0.062
0.008 0.030 0.064
0.0098 0.035 0.070
0.010 0.040 0.082
0.12 0.043  
All Coil Slit to Your Width - Other sizes available on request


ASTM F15 Alloy / Kovar Sheet Cold Rolled
Kovar Bright Annealed MIL I 23011C, CL.1
Thickness   Widths   Lengths
0.015 x 12, 13, 24" x 72
0.020 x 12, 13, 24" x 72
0.025 x 12, 13, 24" x 72
0.030 x 12, 13, 24" x 72
0.035 x 12, 13, 24" x 72
0.040 x 12, 13, 24" x 72
0.050 x 12, 13, 24" x 72
0.060 x 12, 13, 24" x 72
0.062 x 12, 24" x 72
0.072 x 12, 24" x 72
0.075 x 12, 24" x 72
0.080 x 12, 24" x 72
0.090 x Random Width x 72
0.092 x Random Width x 72
0.100 x Random Width x 72
0.115 x Random Width x 72
0.125 x Random Width x 72
other sizes available upon request

ASTM F15 Alloy / Kovar Coil
0.004 x 12 x coil 0.0125 x 12 x coil
0.0045 x 12 x coil 0.0142 x 12 x coil
0.005 x 12 x coil 0.0145 x 12 x coil
0.006 x 12 x coil 0.015 x 12 x coil
0.007 x 12 x coil 0.020 x 12 x 72
0.008 x 12 x coil 0.025 x 12 x 72
0.0095 x 12 x coil 0.030 x 12 x 72
0.010 x 12 x coil  
other sizes available upon request

ASTM F15 / Kovar Plate- Hot Rolled
Kovar / MIL I 23011C Class 1
Ni/ Iron / Cobalt Alloy
0.150 x 15 x 72 0.500 x 15 x 72
0.164 x 15 x 72 0.515 x 15 x 72
0.187 x 15 x 72 0.540 x 15 x 72
0.210 x 15 x 72 0.587 x 15 x 72
0.235 x 15 x 72 0.625 x 15 x 72
0.250 x 15 x 72 0.687 x 15 x 72
0.260 x 15 x 72 0.700 x 15 x 72
0.281 x 15 x 72 0.750 x 15 x 72
0.312 x 15 x 72 0.850 x 15 x 72
0.320 x 15 x 72 0.860 x 15 x 48
0.375 x 15 x 72 0.875 x 15 x 48
0.390 x 15 x 72 1.00 x 15 x 31
0.400 x 15 x 72 1.50 x 15 x 31
0.425 x 15 x 72 2.00 x 15 x 24
0.437 x 15 x 72  
other sizes also available upon request

ASTM F15 Alloy / Kovar Rod / Bar
Certified to -196 °C with no phase transformation
Diameter
0.040 0.187 0.500 0.1375
0.050 0.200 0.562 1.500
0.060 0.203 0.625 1.625
0.062 0.218 0.750 1.750
0.100 0.250 0.875 2.0
0.125 0.312 1.0 2.125
0.156 0.375 1.125 2.5
0.178 0.437 1.250 3.0
Available to 6" Dia
Other sizes of Kovar Available upon request

Availablity Kovar rod, Kovar bar, Kovar sheet, Kovar plate, Kovar wire, Kovar tube.

For all stock availability contact Sales.

Disclaimer
Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.

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